chlorine gas

US officials confident chlorine and sarin used in Syria attack

Senior US officials expressed confidence Saturday that both chlorine and sarin gas were used in Syria's alleged chemical weapons attack on the Damascus enclave of Douma last week -- a conclusion that went a step further than Vice President Mike Pence did in his remarks earlier Saturday.

Mattis warns Syria against using chemical weapons

Secretary of Defense James Mattis has warned the Syrian regime against the use of chemical weapons, telling reporters Friday "you have all seen how we reacted to that, so they'd be ill advised to go back to violating the chemical convention."